4640681868 has 12 divisors (see below), whose sum is σ = 10828257720. Its totient is φ = 1546893952.

The previous prime is 4640681861. The next prime is 4640681869. The reversal of 4640681868 is 8681860464.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 4640681868.

It is not an unprimeable number, because it can be changed into a prime (4640681861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193361733 + ... + 193361756.

It is an arithmetic number, because the mean of its divisors is an integer number (902354810).

Almost surely, 2^4640681868 is an apocalyptic number.

It is an amenable number.

4640681868 is an abundant number, since it is smaller than the sum of its proper divisors (6187575852).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4640681868 is a wasteful number, since it uses less digits than its factorization.

4640681868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386723496 (or 386723494 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 51.

The square root of 4640681868 is about 68122.5503632975. The cubic root of 4640681868 is about 1667.9918812756.

The spelling of 4640681868 in words is "four billion, six hundred forty million, six hundred eighty-one thousand, eight hundred sixty-eight".